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[clang] static operators should evaluate object argument (llvm#68485)
### Description
clang don't evaluate the object argument of `static operator()` and
`static operator[]` currently, for example:
```cpp
#include <iostream>
struct Foo {
static int operator()(int x, int y) {
std::cout << "Foo::operator()" << std::endl;
return x + y;
}
static int operator[](int x, int y) {
std::cout << "Foo::operator[]" << std::endl;
return x + y;
}
};
Foo getFoo() {
std::cout << "getFoo()" << std::endl;
return {};
}
int main() {
std::cout << getFoo()(1, 2) << std::endl;
std::cout << getFoo()[1, 2] << std::endl;
}
```
`getFoo()` is expected to be called, but clang don't call it currently
(17.0.2). This PR fixes this issue.
Fixes llvm#67976.
### Walkthrough
- **clang/lib/Sema/SemaOverload.cpp**
- **`Sema::CreateOverloadedArraySubscriptExpr` &
`Sema::BuildCallToObjectOfClassType`**
Previously clang generate `CallExpr` for static operators, ignoring the
object argument. In this PR `CXXOperatorCallExpr` is generated for
static operators instead, with the object argument as the first
argument.
- **`TryObjectArgumentInitialization`**
`const` / `volatile` objects are allowed for static methods, so that we
can call static operators on them.
- **clang/lib/CodeGen/CGExpr.cpp**
- **`CodeGenFunction::EmitCall`**
CodeGen changes for `CXXOperatorCallExpr` with static operators: emit
and ignore the object argument first, then emit the operator call.
- **clang/lib/AST/ExprConstant.cpp**
- **`ExprEvaluatorBase::handleCallExpr`**
Evaluation of static operators in constexpr also need some small changes
to work, so that the arguments won't be out of position.
- **clang/lib/Sema/SemaChecking.cpp**
- **`Sema::CheckFunctionCall`**
Code for argument checking also need to be modify, or it will fail the
test `clang/test/SemaCXX/overloaded-operator-decl.cpp`.
### Tests
- **Added:**
- **clang/test/AST/ast-dump-static-operators.cpp**
Verify the AST generated for static operators.
- **clang/test/SemaCXX/cxx2b-static-operator.cpp**
Static operators should be able to be called on const / volatile
objects.
- **Modified:**
- **clang/test/CodeGenCXX/cxx2b-static-call-operator.cpp**
- **clang/test/CodeGenCXX/cxx2b-static-subscript-operator.cpp**
Matching the new CodeGen.
### Documentation
- **clang/docs/ReleaseNotes.rst**
Update release notes.
---------
Co-authored-by: Shafik Yaghmour <[email protected]>
Co-authored-by: cor3ntin <[email protected]>
Co-authored-by: Aaron Ballman <[email protected]>- Loading branch information
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Jan 30, 2024
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,55 @@ | ||
| // RUN: %clang_cc1 -std=c++23 %s -ast-dump -triple x86_64-unknown-unknown -o - | FileCheck -strict-whitespace %s | ||
|
|
||
| struct Functor { | ||
| static int operator()(int x, int y) { | ||
| return x + y; | ||
| } | ||
| static int operator[](int x, int y) { | ||
| return x + y; | ||
| } | ||
| }; | ||
|
|
||
| Functor& get_functor() { | ||
| static Functor functor; | ||
| return functor; | ||
| } | ||
|
|
||
| void call_static_operators() { | ||
| Functor functor; | ||
|
|
||
| int z1 = functor(1, 2); | ||
| // CHECK: CXXOperatorCallExpr {{.*}} 'int' '()' | ||
| // CHECK-NEXT: |-ImplicitCastExpr {{.*}} <col:19, col:24> 'int (*)(int, int)' <FunctionToPointerDecay> | ||
| // CHECK-NEXT: | `-DeclRefExpr {{.*}} <col:19, col:24> 'int (int, int)' lvalue CXXMethod {{.*}} 'operator()' 'int (int, int)' | ||
| // CHECK-NEXT: |-DeclRefExpr {{.*}} <col:12> 'Functor' lvalue Var {{.*}} 'functor' 'Functor' | ||
| // CHECK-NEXT: |-IntegerLiteral {{.*}} <col:20> 'int' 1 | ||
| // CHECK-NEXT: `-IntegerLiteral {{.*}} <col:23> 'int' 2 | ||
|
|
||
| int z2 = functor[1, 2]; | ||
| // CHECK: CXXOperatorCallExpr {{.*}} 'int' '[]' | ||
| // CHECK-NEXT: |-ImplicitCastExpr {{.*}} <col:19, col:24> 'int (*)(int, int)' <FunctionToPointerDecay> | ||
| // CHECK-NEXT: | `-DeclRefExpr {{.*}} <col:19, col:24> 'int (int, int)' lvalue CXXMethod {{.*}} 'operator[]' 'int (int, int)' | ||
| // CHECK-NEXT: |-DeclRefExpr {{.*}} <col:12> 'Functor' lvalue Var {{.*}} 'functor' 'Functor' | ||
| // CHECK-NEXT: |-IntegerLiteral {{.*}} <col:20> 'int' 1 | ||
| // CHECK-NEXT: `-IntegerLiteral {{.*}} <col:23> 'int' 2 | ||
|
|
||
| int z3 = get_functor()(1, 2); | ||
| // CHECK: CXXOperatorCallExpr {{.*}} 'int' '()' | ||
| // CHECK-NEXT: |-ImplicitCastExpr {{.*}} <col:25, col:30> 'int (*)(int, int)' <FunctionToPointerDecay> | ||
| // CHECK-NEXT: | `-DeclRefExpr {{.*}} <col:25, col:30> 'int (int, int)' lvalue CXXMethod {{.*}} 'operator()' 'int (int, int)' | ||
| // CHECK-NEXT: |-CallExpr {{.*}} <col:12, col:24> 'Functor' lvalue | ||
| // CHECK-NEXT: | `-ImplicitCastExpr {{.*}} <col:12> 'Functor &(*)()' <FunctionToPointerDecay> | ||
| // CHECK-NEXT: | `-DeclRefExpr {{.*}} <col:12> 'Functor &()' lvalue Function {{.*}} 'get_functor' 'Functor &()' | ||
| // CHECK-NEXT: |-IntegerLiteral {{.*}} <col:26> 'int' 1 | ||
| // CHECK-NEXT: `-IntegerLiteral {{.*}} <col:29> 'int' 2 | ||
|
|
||
| int z4 = get_functor()[1, 2]; | ||
| // CHECK: CXXOperatorCallExpr {{.*}} 'int' '[]' | ||
| // CHECK-NEXT: |-ImplicitCastExpr {{.*}} <col:25, col:30> 'int (*)(int, int)' <FunctionToPointerDecay> | ||
| // CHECK-NEXT: | `-DeclRefExpr {{.*}} <col:25, col:30> 'int (int, int)' lvalue CXXMethod {{.*}} 'operator[]' 'int (int, int)' | ||
| // CHECK-NEXT: |-CallExpr {{.*}} <col:12, col:24> 'Functor' lvalue | ||
| // CHECK-NEXT: | `-ImplicitCastExpr {{.*}} <col:12> 'Functor &(*)()' <FunctionToPointerDecay> | ||
| // CHECK-NEXT: | `-DeclRefExpr {{.*}} <col:12> 'Functor &()' lvalue Function {{.*}} 'get_functor' 'Functor &()' | ||
| // CHECK-NEXT: |-IntegerLiteral {{.*}} <col:26> 'int' 1 | ||
| // CHECK-NEXT: `-IntegerLiteral {{.*}} <col:29> 'int' 2 | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,31 @@ | ||
| // RUN: %clang_cc1 -fsyntax-only -verify -std=c++23 %s | ||
|
|
||
| // expected-no-diagnostics | ||
|
|
||
| namespace A { | ||
|
|
||
| struct Foo { | ||
| static int operator()(int a, int b) { return a + b; } | ||
| static int operator[](int a, int b) { return a + b; } | ||
| }; | ||
|
|
||
| void ok() { | ||
| // Should pass regardless of const / volatile | ||
| Foo foo; | ||
| foo(1, 2); | ||
| foo[1, 2]; | ||
|
|
||
| const Foo fooC; | ||
| fooC(1, 2); | ||
| fooC[1, 2]; | ||
|
|
||
| const Foo fooV; | ||
| fooV(1, 2); | ||
| fooV[1, 2]; | ||
|
|
||
| const volatile Foo fooCV; | ||
| fooCV(1, 2); | ||
| fooCV[1, 2]; | ||
| } | ||
|
|
||
| } |